package org.smart4j.framework.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

/**
 * 属性文件读取工具
 *
 * @author LG93
 * @create 2017-08-10 16:15
 **/
public final class PropsUtils {

	private static final Logger logger = LoggerFactory.getLogger(PropsUtils.class);

	/**
	 * 加载属性文件
	 *
	 * @param fileName
	 * @return
	 */
	public static Properties loadProperties(String fileName) {

		Properties properties = null;
		InputStream is = null;
		try {
			is = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);
			if (is == null) {
				throw new FileNotFoundException(fileName + " file is not found ");
			}
			properties = new Properties();
			properties.load(is);
		} catch (IOException e) {
			logger.error(" load properties file failure", e);
		} finally {
			if (is != null) {
				try {
					is.close();
				} catch (IOException e) {
					logger.error("close input stream failure", e);
				}
			}
			return properties;
		}

	}

	/**
	 * 获取字符属性（默认值为空字符串）
	 *
	 * @param props
	 * @param key
	 * @return
	 */
	public static String getString(Properties props, String key) {
		return getString(props, key, "");
	}

	/**
	 * 获取字符属性（可指定默认值）
	 *
	 * @param props
	 * @param key
	 * @param defaultValue
	 * @return
	 */
	public static String getString(Properties props, String key, String defaultValue) {
		String value = defaultValue;
		if (props.containsKey(key)) {
			value = props.getProperty(key);
		}
		return value;
	}

	/**
	 * 获取数值型属性 （默认为0）
	 * @param props
	 * @param key
	 * @return
	 */
	public static int getInt(Properties props, String key) {
		return getInt(props, key, 0);
	}

	/**
	 * 获取数值型属性 （可指定默认值）
	 * @param props
	 * @param key
	 * @param defaultValue
	 * @return
	 */
	private static int getInt(Properties props, String key, int defaultValue) {

		int value = defaultValue;
		if (props.containsKey(key)) {
			value = CastUtil.castInt(props.getProperty(key));
		}
		return value;
	}

	/**
	 * 获取布尔型属性（默认为false）
	 * @param props
	 * @param key
	 * @return
	 */
	private static boolean getBoolean(Properties props, String key) {
		return getBoolean(props, key, false);
	}

	/**
	 * 获取布尔型属性（可指定默认值）
	 * @param props
	 * @param key
	 * @return
	 */
	private static boolean getBoolean(Properties props, String key, boolean defaultValue) {
		boolean value = defaultValue;
		if (props.containsKey(key)) {
			value = CastUtil.castBoolean(props.getProperty(key));
		}
		return value;
	}
}
